The Cartridge headshell bolts kit is all you will need to mount any cartridge to any headshell. The selection of headshell allen bolts cater for the full range of cartridge body depths. Allen bolts for cartridges should be non magnetic to prevent degrading the cartridge magnets. Although aluminium bolts are used in some cases, audio enthusiasts prefer stainless steel headshell bolts becauise they give better results in terms of sound quality, are less fiddly and can be tightened more firmly using an Allen key.